Dual-color sensitometer

Details Dual-color sensitometer Dual-color sensitometer

1982-03-05

1985-01-01

Gonzales, John

Electric lamp and discharge devices

With temperature modifier

For lead-in-seal or stem protection

313507, G03B 4100

Patent

active

044914008

ABSTRACT:
A dual-color photographic sensitometer for exposing a piece of test film to a known amount of light of a selectable one of two different colors. The multiple-step density gradient of the sensitometer is uniformly illuminated along its entire length by an electroluminescent lamp comprising a plurality of phosphor segments of varying widths which are electrically connected to form two sets, with each of the segments in each set adapted upon excitation to emit a single color light. The width of each segment of a set is determined in accordance with its distance from the multiple-step density gradient so that the multiple-step density gradient is illuminated substantially uniformly by each segment set.

REFERENCES:
patent: 4235537 (1980-11-01), Thompson
patent: 4396864 (1983-08-01), Suntola et al.

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